threads/103127: Kernel panic while using thread features in Squid 2.6

[John-Mark Gurney]

Anders Nordby wrote this message on Wed, Sep 13, 2006 at 20:58 +0200:
> After talking with Pawel, I tried the attached patch to get some kqueue
> debug info. I just got it:
> 
> Sep 13 20:18:56 cache3 kernel: NULL f_event in new kn
> Sep 13 20:18:56 cache3 kernel: f_event == NULL

This means that the f_attach method for that event isn't setting f_event
properly...  We need to figure out which event this is happening w/...

Try the following modifications:
> --- sys/kern/kern_event.c.orig	Wed Sep 13 08:44:57 2006
> +++ sys/kern/kern_event.c	Wed Sep 13 08:51:03 2006
> @@ -900,6 +900,8 @@
>  				goto done;
>  			}
>  			KN_LIST_LOCK(kn);
> +			if (kn->kn_fop->f_event == NULL)
 {
> +				printf("NULL f_event in new kn\n");
			printf("kn: ident: %d, filter: %d\n", kn->kn_ident, kn->kn_filter);
}
>  		} else {
>  			/*
>  			 * The user may change some filter values after the

I have a feeling that this is a similar panic that jhb is seeing...
Which means that filter will be EVFILT_VNODE (-4)...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."